186551 - JS screen.width returns wrong value

Status: VERIFIED DUPLICATE of bug 62395

(Core :: DOM: Core & HTML, defect)

Description

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User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130
Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.2.1) Gecko/20021130

I'm using this little JavaScript to set a 'nice' font size and margin, but for
example, for the 'real' screen width 1152 (also 1280?), JS screen.width returns
1024. IE & Opera are working correct.

<script type="text/javascript">
<!--
	var swx = screen.width;
	var shx = screen.height;

	// Default for 17 inch, 1024 x 768
	var fsx = "11";
	var mlp = "2.5";
	var mrp = "14.5";

	if (swx >= 1600) {fsx = "15"; mlp = "2.5"; mrp = "15.5";}
	else if (swx >= 1280) {fsx = "14"; mlp = "2.5"; mrp = "15.5";}
	else if (swx >= 1152) {fsx = "12"; mlp = "2.5"; mrp = "15.5";}
	else if (swx >= 1024) {fsx = "11"; mlp = "2.5"; mrp = "14.5";}
	else if (swx >= 800) {fsx = "10"; mlp = "1.5"; mrp = "1.5";}
	else if (swx >= 640) {fsx = "9"; mlp = "1.5"; mrp = "1.5";}

	document.write('<div style="margin-left:', mlp, '%; margin-right:', mrp, '%;
font-size:', fsx, 'px;">');
//-->
</script>


Reproducible: Always

Steps to Reproduce:
1. Set the screen width in your system to 1152.
2. Go to the link.


Actual Results:  
The font size is 11 and not 12.

Expected Results:  
screen.width (and maybe also screen.height) should return the correct values
from the system.

I know each user should set his own font-size in the browser :-) but it should work!

Comment 1

[Ruslan Ismailov]

I play a little with this bug (btw, it is enough to put
javascript:alert(screen.width) in URL field) and found, that if user change
screen and NOT RESTART mozilla, than width and height report old value, but if
user restart it -- correct values appeared. 

I propose that screen parametes should be detected when screen methods working,
not at start of Mozilla.

Comment 2

[Boris Zbarsky [:bzbarsky]]

*** This bug has been marked as a duplicate of 62395 ***

Comment 3

[Henrik Skupin [:whimboo][⌚️UTC+1]]

verified.